Right now Signal Service runs the Let'sEncrypt manager on port 80
and a gRPC server on port 10000. There are two separate listeners.
This PR combines these listeners into one with a cmux lib.
The gRPC server runs on either 443 with TLS or 80 without TLS.
Let's Encrypt manager always runs on port 80.
The Management client will try reconnecting in case.
of network issues or non-permanent errors.
If the device was off-boarded, then the client will stop retrying.
* feature: support new management service protocol
* chore: add more logging to track networkmap serial
* refactor: organize peer update code in engine
* chore: fix lint issues
* refactor: extract Signal client interface
* test: add signal client mock
* refactor: introduce Management Service client interface
* chore: place management and signal clients mocks to respective packages
* test: add Serial test to the engine
* fix: lint issues
* test: unit tests for a networkMapUpdate
* test: unit tests Sync update
* fix: too many open files caused by agent not being closed after unsuccessful attempts to start a peer connection (happens when no network available)
* fix: minor refactor to consider signal status
* refactor: move goroutine that runs Signal Client Receive to the engine for better control
* chore: fix comments typo
* test: fix golint
* chore: comments update
* chore: consider connection state=READY in signal and management clients
* chore: fix typos
* test: fix signal ping-pong test
* chore: add wait condition to signal client
* refactor: add stream status to the Signal client
* refactor: defer mutex unlock
